EARLY CAMBRIAN REEFS AND BANKS DEVELOPMENT IN SOUTHERN MARGIN OF DABA Mt. AND Micang Mt.
大巴山、米仓山南缘早寒武世礁滩发育特征

In the Early Cambrian,the southern margin of Daba Mt.and Micang Mt.located at the northern margin of Upper Yangze Platform.The reefs and banks which developed at the margin of carbonate platform,distributed in the area of Nanzheng,Xixiang,Zhengba,Ziyang of Sanxi province and nanjiang of Sichuan.The reefs and banks include cyanobacteriaArchaeocyathus reefs,thrombolite micrite mounds,oncolite biostromes and bioclasic & oolitic banks.The reef building organisms have Archaeocyathus,cyanobacteria.And the biomarks analyses are also proved that the microbial materials are in mud mounds.The reef living organisms have brachiopoda,trilobite,crinoida,sponge.Because of the sealevel change and paleogeographic environment control,the reefs and banks show the cycle sequence,and migrate upper in sequence from the west to the east.